302 MM. Wilson and Crick—The Lias Marlstone of Tilton. 
Deslongchamps. The original illustrations are far from satisfactory : 
but the figured shell has a spire which is identical in its form and 
proportions, and apparently also in its ornamentation, with the 
above type, and I therefore make this identification with some con- 
fidence in its accuracy. 
Marlstone Rock, Tilton (Hast Norton embankment). 
CeritHium I~mMinstERENsIs, Moore, 1866. Plate IX. Figs. 5a, 56, 5c. 
1865-6. C. Ilminsterensis, Moore, Proc. Somerset Arch. and Nat. Hist. Soc. vol. 
xi. p. 200, pl. iv. s. 12, 12a. 
There are a number of specimens of a shell which agrees in its 
general characters with Moore’s type. These shells are twice the 
length of the type, with the same number of whorls, and also differ 
from C. Ilminsterensis, Moore, agreeing with C. Dayii, Tate, in 
having four rows of subspinous encircling costule instead of three 
in each whorl. These small points of difference do not, however, 
seem to me to be characters of specific value. 
Marlstone Rock, Tilton (Hast Norton embankment). 
PsEUDOMELANIA (CHEMNITZIA) Brannoviensis, Dumortier, 1869. 
Plate IX. Figs. 6, 7. 
1869. Chemnitzia Brannoviensis, Dumort. Etudes Pal. sur les Dépdts Jurass, du 
Bassin du Rhone, pt. iil. p. 218, pl. 27, f. 11. 
The Marlstone blocks on the Hast Norton embankment have 
yielded us a number of shells which, although of much smaller 
dimensions, seem to agree with this type of Dumortier’s. Seeing 
that this fossil has not hitherto been recorded from the British Lias, 
the following description and the illustrations here given may be of 
interest to the students of the English Jura. I adopt the generic 
designation of Pictet and Campiche as applicable to this form. 
Description :—‘ Shell conical, short, imperforate: spiral angle regu- 
lar; whorls eight, flat or very slightly convex, covered with trans- 
verse lines of growth, forming thick irregular obscure plice, which 
give origin close to the suture posteriorly, to a series of nodules, 
slightly scalariform. Aperture high, oval, very oblique, without 
callosity over the columella. The last whorl occupies nearly half 
the total height. Length to width 82: 17. Spiral angle 438°.” 
Hast Norton specimens give: Height 22 mm.; Diameter 11 mm.; 
Spiral angle 42°. 
Marlstone Rock, Tilton (Hast Norton embankment). 
PsEUDOMELANIA (PHASIANELLA) TURBINATA, Stoliczka, 1861. 
: Plate IX. Figs. 8, 9. 
1861.- Phasianella turbinata, Stol., Gast. und Aceph. der Hierlatz-Schichten, 
Jahrbuch der k. k, Reichsanstalt (Wien), vol. xliii. p. 177, pl. iii. fs. 1. 2. 
Like Ps. Brannoviensis, this is fairly common at Tilton. The 
genus Pseudomelania is suggested as a more fitting generic appella- 
tion for this form also. 
Marlstone Rock, Tilton (Hast Norton embankment). 
